Replace memory-streams package for memorystream #111

[jlopezxs]

Pull request to replace memorystreams package.
This replace is to fix bug #111 of superfluous memory.

[codecov-io]

Codecov Report

Merging #112 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #112   +/-   ##
=======================================
  Coverage   91.86%   91.86%           
=======================================
  Files          22       22           
  Lines         455      455           
=======================================
  Hits          418      418           
  Misses         37       37

Impacted Files	Coverage Δ
lib/run-tasks.js	85.07% <100%> (ø)	⬆️

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[mysticatea]

I apology that I'm late to check this PR.
I will do within a few days.

[mysticatea]

LGTM.

I'm sorry for delay.
I had misunderstood about this issue. It was not about memory usage. The memory-streams package seems to stop receiving after it has received some data due to backpressure.